Try timeout

test/integration_test.rb

@@ -140,9 +140,6 @@ def test_launch_mode_with_no_gemfile_and_bundle_path
       Bundler.with_unbundled_env do
         system("bundle config --local path #{File.join("vendor", "bundle")}")
         assert_path_exists(File.join(dir, ".bundle", "config"))
-      end
-
-      Bundler.with_unbundled_env do
         launch(dir)
       end
     end
@@ -151,16 +148,7 @@ def test_launch_mode_with_no_gemfile_and_bundle_path
   private
 
   def launch(workspace_path)
-    load_path = $-I.map do |p|
-      "-I#{File.expand_path(p)}"
-    end.join(" ")
-
-    stdin, stdout, stderr, wait_thr = T.unsafe(Open3).popen3(
-      ENV.to_hash,
-      Gem.ruby,
-      load_path,
-      File.join(@root, "exe", "ruby-lsp-launcher"),
-    )
+    stdin, stdout, stderr, wait_thr = Open3.popen3(Gem.ruby, File.join(@root, "exe", "ruby-lsp-launcher"))
     stdin.sync = true
     stdin.binmode
     stdout.sync = true
@@ -180,14 +168,17 @@ def launch(workspace_path)
     send_message(stdin, { id: 2, method: "shutdown" })
     send_message(stdin, { method: "exit" })
 
-    begin
-      Process.wait(wait_thr.pid)
-    rescue Errno::ECHILD
-      nil
+    # Wait until the process exits
+    wait_thr.join
+
+    unless T.unsafe(wait_thr.value).success?
+      require "timeout"
+
+      Timeout.timeout(5) do
+        flunk("Process failed\n#{stderr.read}")
+      end
     end
 
-    wait_thr.join
-    refute_predicate(wait_thr, :alive?)
     assert_path_exists(File.join(workspace_path, ".ruby-lsp", "bundle_gemfile"))
     assert_path_exists(File.join(workspace_path, ".ruby-lsp", "Gemfile"))
     assert_path_exists(File.join(workspace_path, ".ruby-lsp", "Gemfile.lock"))